Hey there..
I had installed an aftermarket stereo in my truck sometime back...I have a 2003 sonoma. I bought the deck at best buy where the tech there inforemed me of a problem that occurs with the truck when you do not instal an additional module. The problem regarded the door chime and I believe also effected the trucks ignition system...My advice to you is to contact a stereo retailer such as best buy and talk to the tech's...i purchased the module there and was roughly 150 cdn dollars...Shaun